Keystone uni lugs???

Got a set of Keystone uni lugs from Tom(Millwright 71) that came on his Dodge,that still had good tires. Tried tuning lug plugs around and they don't seem to line up righjt,will fit without plugs(not driving on them) Then I noticed that on the back ones(still set up for Dodge,some have hole toward inside & some outside(3 & 2 ) andare marked A on back side. How do these plugs(adadters) work for Chevy,do the use different ones??